Sensor element for limit current probes for determining the &lgr; value of gas mixtures and method for its calibration
US6732565B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1998 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | Sep 22, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor element for limit current probes for determining the &lgr; value of gas mixtures and a method of calibrating such sensor elements. The sensor element has an internal and an external pump electrode arranged on a ceramic body, the internal pump electrode being arranged in a diffusion channel delimited by a diffusion barrier, and a gas intake orifice running through the ceramic substrate and the diffusion channel in a direction that is essentially perpendicular to the surface of the ceramic substrate. The diffusion resistance of the diffusion barrier can be adjusted essentially linearly by selectively changing the diameter of the gas intake orifice. Calibration is performed by selecting at least one sensor element of a production lot, whose pump voltage is, measured at a selected pump current, from which the optimum diameter of the gas intake orifice can be calculated from the deviations from the ideal values using a simple ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.